Influence of CNTs addition on the mechanical, microstructural, and corrosion properties of Al alloy using spark plasma sintering technique

Ujah, Chika Oliver; Popoola, A. P. I.; Popoola, Olawale; Aigbodion, V.S.

doi:10.1007/s00170-019-04699-7

Cited by 32 publications

(18 citation statements)

References 33 publications

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“…Similarly, the hardness values obtained for samples M1–M3 confirm that when the CNT clusters are located in the grain boundaries, as illustrated in Figure 2 , produce an effective mechanical reinforcement that increases the hardness of the thermally treated sample. This is consistent with the results obtained by Ujah et al in [ 31 ] which is attributed to the homogenous dispersion of the CNTs reinforcement.…”

Section: Resultssupporting

confidence: 93%

“…The tests were performed applying a force of 100 g for 15 s. The HNV values were calculated by dividing the load by the surface area of the indentation. Thereafter, the tensile and yield strengths were calculated using the method of Cahoon et al [ 29 ], which has been used previously by Ujah et al [ 30 , 31 ], given in the following equations:

where T is the tensile strength of the material (MPa), Y is yield strength of the material (MPa),

is microhardness of the material (N/m 2 ) and n is the strain-hardening coefficient of the material. For this work, n was taken as 0.2 as reported by Callister [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

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Spark Plasma Sintering of Aluminum-Based Powders Reinforced with Carbon Nanotubes: Investigation of Electrical Conductivity and Hardness Properties

et al. 2021

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This paper focuses on reporting results obtained by the spark plasma sintering (SPS) consolidation and characterization of aluminum-based nanocomposites reinforced with concentrations of 0.5 wt%, 1 wt% and 2 wt% of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs). Experimental characterization performed by SEM shows uniform carbon nanotube (CNT) dispersion as well as carbon clusters located in the grain boundary of the Al matrix. The structural analysis and crystallite size calculation were performed by X-ray diffraction tests, detecting the characteristic CNT diffraction peak only for the composites reinforced with MWCNTs. Furthermore, a considerable increment in the crystallite size value for those Al samples reinforced and sintered with 1 wt% of CNTs was observed. Hardness tests show an improvement in the composite surface hardness of about 11% and 18% for those samples reinforced with 2 wt% of SWNCTs and MWCNTs, respectively. Conductivity measurements show that the Al samples reinforced with 2 wt% of MWCNTs and with 0.5 wt% SWCNTs reach the highest IACS values of 50% and 34%, respectively.

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Section: Resultssupporting

confidence: 93%

where T is the tensile strength of the material (MPa), Y is yield strength of the material (MPa),

is microhardness of the material (N/m 2 ) and n is the strain-hardening coefficient of the material. For this work, n was taken as 0.2 as reported by Callister [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

Spark Plasma Sintering of Aluminum-Based Powders Reinforced with Carbon Nanotubes: Investigation of Electrical Conductivity and Hardness Properties

et al. 2021

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“…As can be seen, the Al and G powders were distributed uniformly inside the specimens made with recipes 6, 4, and 2. This result indicates that no any agglomeration [ 37 ] and precipitation [ 38 ] of the Al and G powders inside the specimens were found.…”

Section: Resultsmentioning

confidence: 90%

Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

Kuo

2021

Polymers

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Silicone rubber mold (SRM) is capable of reducing the cost and time in a new product development phase and has many applications for the pilot runs. Unfortunately, the SRM after injection molding has a poor cooling efficiency due to its low thermal conductivity. To improve the cooling efficiency, the thermal conductivity of the SRM was improved by adding fillers into the SRM. An optimal recipe for fabricating a high cooling efficiency low-pressure injection mold with conformal cooling channel fabricated by fused deposition modeling technology was proposed and implemented. This study proposes a recipe combining 52.6 wt.% aluminum powder, 5.3 wt.% graphite powder, and 42.1 wt.% liquid silicon rubber can be used to make SRM with excellent cooling efficiency. The price–performance ratio of this SRM made by the proposed recipe is around 55. The thermal conductivity of the SRM made by the proposed recipe can be increased by up to 77.6% compared with convention SRM. In addition, the actual cooling time of the injection molded product can be shortened up to 69.1% compared with the conventional SRM. The actual cooling time obtained by the experiment is in good agreement with the simulation results with the relative error rate about 20%.

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“…These results have allowed to identify the best conditions to develop Al-based nanocomposites with enhance physical properties. Other research works focus on studying how the wt % concentration of CNT influences the sample densification [21] and dispersion to create an effective 2D CNT network capable of improving electrical conductivity [25,[31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, it was investigated in [ 28 , 29 , 30 ] the impact of the CNT content in the consolidation of nanocomposite powders when varying experimental conditions like load pressure, temperature and holding sintering time. There, the authors concluded that the formation of large-sized CNT clusters hinder particle interaction during sintering process leading to the formation of cracks, pores or voids [ 1 , 31 ]. These results have allowed to identify the best conditions to develop Al-based nanocomposites with enhance physical properties.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Electrical Conductivity of Aluminum-Based Nanocomposite Produced by Spark Plasma Sintering

Ulloa-Castillo

Hernandez-Maya²,

Islas-Urbano

et al. 2021

Nanomaterials

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This article focuses on exploring how the electrical conductivity and densification properties of metallic samples made from aluminum (Al) powders reinforced with 0.5 wt % concentration of multi-walled carbon nanotubes (MWCNTs) and consolidated through spark plasma sintering (SPS) process are affected by the carbon nanotubes dispersion and the Al particles morphology. Experimental characterization tests performed by scanning electron microscopy (SEM) and by energy dispersive spectroscopy (EDS) show that the MWCNTs were uniformly ball-milled and dispersed in the Al surface particles, and undesirable phases were not observed in X-ray diffraction measurements. Furthermore, high densification parts and an improvement of about 40% in the electrical conductivity values were confirmed via experimental tests performed on the produced sintered samples. These results elucidate that modifying the powder morphology using the ball-milling technique to bond carbon nanotubes into the Al surface particles aids the ability to obtain highly dense parts with increasing electrical conductivity properties.

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Influence of CNTs addition on the mechanical, microstructural, and corrosion properties of Al alloy using spark plasma sintering technique

Cited by 32 publications

References 33 publications

Spark Plasma Sintering of Aluminum-Based Powders Reinforced with Carbon Nanotubes: Investigation of Electrical Conductivity and Hardness Properties

Spark Plasma Sintering of Aluminum-Based Powders Reinforced with Carbon Nanotubes: Investigation of Electrical Conductivity and Hardness Properties

Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

Enhancement of Electrical Conductivity of Aluminum-Based Nanocomposite Produced by Spark Plasma Sintering

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